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Finding the Fourth Proportional to 143,985.60, 215,978.40 and 91,432.80

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Solution

The fourth proportional to 143,985.60, 215,978.40 and 91,432.80 is: 137,149.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,985.60 : 215,978.40 = 91,432.80 : x
  2. Step 2: Convert to fraction form
    143,985.60/215,978.40 = 91,432.80/x
  3. Step 3: Cross multiply
    143,985.60x = 215,978.40 × 91,432.80
  4. Step 4: Simplify right side
    143,985.60x = 19,747,509,851.52
  5. Step 5: Solve for x
    x = 19,747,509,851.52/143,985.60
  6. Step 6: Final answer
    x = 137,149.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.